The second opinion on Corey Hart’s ailing right knee turned out to be about the same as the first. The outcome: The Brewers’ first baseman underwent surgery Friday morning, the club announced.

Hart is expected to need four months to recover, which means he likely won’t be in the Brewers’ lineup until June. Mat Gamel, who started last season at first base before suffering a season-ending knee surgery, is the likely replacement.

Hart’s right knee began bothering him in off-season workouts, according to the Milwaukee Journal Sentinel. He delayed surgery for a few days this week to have the knee examined by Dr. Richard Steadman.

The procedure was performed by Brewers team physician William Raasch. According to the Brewers, Hart had a small meniscal tear repaired and the joint surface on his right kneecap debrided.

Hart, 30, hit .270 with 30 homers and tied a career-best with 91 runs last season. He moved from right field to first base after Gamel was injured and took so well to the position that he stayed there.